Add the flour and the baking powder and process for another 5 to 10 seconds, or until smooth. Butter an 8-inch round cake pan (2 inches deep) with the reserved 1/2 teaspoon butter. Pour the cake ...

Here’s a link to Stewart’s winning recipe: Preheat oven to 350 degrees. Grease three 8-inch round cake pans lined with parchment paper. Sift flour, sugar, cocoa, baking soda, baking powder and ...